Can I use a 45" insert over a 48" range? If so, then what items are required to vent to the roof.A. Yes a 45" insert will work over a 48" range. To duct the unit you will need ducting and a wall or roof termination.
Does the custom hood liner come with the RMIP45?A. The liner for The Broan RMIP45 is sold separately from the unit. The liner you would need would depend on the size hood you are looking into. A liner that is recommended for this particular hood is part number RML4560S.